Termination for sheathed tubing with leak containment and detection provisions

A fitting-tubing assembly comprising:

• tubing having peaks and valleys and an outer sheath;
• and
• a fitting secured to the tubing, the fitting comprising:
• an engagement ring for gripping the tubing axially adjacent to an endmost corrugation of the tubing so as to preclude axial displacement of the engagement ring on the tubing;
• an end plug having a hollow cylindrical part sized to admit and engage with the engagement ring, the end plug having at least one threaded surface, including a threaded external surface;
• a nut having a threaded internal surface complementary with the threaded external surface of the end plug, the nut having a sidewall with an inner surface defining an inner cavity and an annular groove extending from the inner surface and a vent extending through the sidewall and disposed between the threaded surface and the annular groove;
• and
• a gasket disposed in the annular groove, wherein a portion of the gasket extends into the inner cavity and sealingly engages the outer sheath.